Help Mg + HCl  MgCl2 + H2

Double replacement – two compounds switch parts with one another.

AgNO3 + K2SO4  Ag2SO4 + KNO3

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

the dissolution of polymer can be thermodynamically described in 2 steps.